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If you really need access to internet, then you may go ahead and replace the internal SIM. There is a thread explaining it.

that is exactly what i wanna do "onnie", changing the SIM is what i want because there is no AT&T network in my country. I have my local SIM inserted and i can use internet on command line, e.g. Ping, Wget, etc. but the browser doesn't allow me to use the internet (except Shop In Kindle Store). it's the proxy that gives me a problem, so i want to remove it. If you know please help!